This manual entry describes the common configuration options supported
by widgets in the Tk toolkit. Every widget does not necessarily support
every option (see the manual entries for individual widgets for a list
of the standard options supported by that widget), but if a widget does
support an option with one of the names listed below, then the option
has exactly the effect described below.

In the descriptions below,
“Command-Line Name”
refers to the
switch used in class commands and configure widget commands to
set this value. For example, if an option's command-line switch is
-foreground and there exists a widget .a.b.c, then the
command

.a.b.c configure -foreground black

may be used to specify the value black for the option in
the widget .a.b.c. Command-line switches may be abbreviated,
as long as the abbreviation is unambiguous.
“Database Name”
refers to the option's name in the option database (e.g. in .Xdefaults files).
“Database Class”
refers to the option's class value in the option database.

Specifies background color to use when drawing active elements.
An element (a widget or portion of a widget) is active if the
mouse cursor is positioned over the element and pressing a mouse button
will cause some action to occur.
If strict Motif compliance has been requested by setting the
tk_strictMotif variable, this option will normally be
ignored; the normal background color will be used instead.
For some elements on Windows and Macintosh systems, the active color
will only be used while mouse button 1 is pressed over the element.

Specifies a non-negative value indicating
the width of the 3-D border drawn around active elements. See above for
definition of active elements.
The value may have any of the forms acceptable to Tk_GetPixels.
This option is typically only available in widgets displaying more
than one element at a time (e.g. menus but not buttons).

Specifies how the information in a widget (e.g. text or a bitmap)
is to be displayed in the widget.
Must be one of the values n, ne, e, se,
s, sw, w, nw, or center.
For example, nw means display the information such that its
top-left corner is at the top-left corner of the widget.

Specifies a bitmap to display in the widget, in any of the forms
acceptable to Tk_GetBitmap.
The exact way in which the bitmap is displayed may be affected by
other options such as anchor or justify.
Typically, if this option is specified then it overrides other
options that specify a textual value to display in the widget
but this is controlled by the compound option;
the bitmap option may be reset to an empty string to re-enable
a text display.
In widgets that support both bitmap and image options,
image will usually override bitmap.

Specifies a non-negative value indicating the width
of the 3-D border to draw around the outside of the widget (if such a
border is being drawn; the relief option typically determines
this). The value may also be used when drawing 3-D effects in the
interior of the widget.
The value may have any of the forms acceptable to Tk_GetPixels.

Specifies the mouse cursor to be used for the widget.
The value may have any of the forms acceptable to Tk_GetCursor.
In addition, if an empty string is specified, it indicates that the
widget should defer to its parent for cursor specification.

Specifies if the widget should display text and bitmaps/images at the
same time, and if so, where the bitmap/image should be placed relative
to the text. Must be one of the values none, bottom,
top, left, right, or center. For example, the
(default) value none specifies that the bitmap or image should
(if defined) be displayed instead of the text, the value left
specifies that the bitmap or image should be displayed to the left of
the text, and the value center specifies that the bitmap or
image should be displayed on top of the text.

Specifies foreground color to use when drawing a disabled element.
If the option is specified as an empty string (which is typically the
case on monochrome displays), disabled elements are drawn with the
normal foreground color but they are dimmed by drawing them
with a stippled fill pattern.

Specifies whether or not a selection in the widget should also be
the X selection.
The value may have any of the forms accepted by Tcl_GetBoolean,
such as true, false, 0, 1, yes, or no.
If the selection is exported, then selecting in the widget deselects
the current X selection, selecting outside the widget deselects any
widget selection, and the widget will respond to selection retrieval
requests when it has a selection. The default is usually for widgets
to export selections.

Specifies a non-negative value indicating the width of the highlight
rectangle to draw around the outside of the widget when it has the
input focus.
The value may have any of the forms acceptable to Tk_GetPixels.
If the value is zero, no focus highlight is drawn around the widget.

Specifies an image to display in the widget, which must have been
created with the image create command.
Typically, if the image option is specified then it overrides other
options that specify a bitmap or textual value to display in the
widget, though this is controlled by the compound option;
the image option may be reset to an empty string to re-enable
a bitmap or text display.

Specifies the color to use as background in the area covered by the
insertion cursor. This color will normally override either the normal
background for the widget (or the selection background if the insertion
cursor happens to fall in the selection).

Specifies a non-negative integer value indicating the number of
milliseconds the insertion cursor should remain
“off”
in each blink cycle.
If this option is zero then the cursor does not blink: it is on
all the time.

Specifies a value indicating the total width of the insertion cursor.
The value may have any of the forms acceptable to Tk_GetPixels.
If a border has been specified for the insertion
cursor (using the insertBorderWidth option), the border
will be drawn inside the width specified by the insertWidth
option.

For widgets with a slider that can be dragged to adjust a value,
such as scrollbars, this option determines when
notifications are made about changes in the value.
The option's value must be a boolean of the form accepted by
Tcl_GetBoolean.
If the value is false, updates are made continuously as the
slider is dragged.
If the value is true, updates are delayed until the mouse button
is released to end the drag; at that point a single notification
is made (the value
“jumps”
rather than changing smoothly).

When there are multiple lines of text displayed in a widget, this
option determines how the lines line up with each other.
Must be one of left, center, or right.
Left means that the lines' left edges all line up, center
means that the lines' centers are aligned, and right means
that the lines' right edges line up.

For widgets that can lay themselves out with either a horizontal
or vertical orientation, such as scrollbars, this option specifies
which orientation should be used. Must be either horizontal
or vertical or an abbreviation of one of these.

Specifies a non-negative value indicating how much extra space
to request for the widget in the X-direction.
The value may have any of the forms acceptable to Tk_GetPixels.
When computing how large a window it needs, the widget will
add this amount to the width it would normally need (as determined
by the width of the things displayed in the widget); if the geometry
manager can satisfy this request, the widget will end up with extra
internal space to the left and/or right of what it displays inside.
Most widgets only use this option for padding text: if they are
displaying a bitmap or image, then they usually ignore padding
options.

Specifies a non-negative value indicating how much extra space
to request for the widget in the Y-direction.
The value may have any of the forms acceptable to Tk_GetPixels.
When computing how large a window it needs, the widget will add
this amount to the height it would normally need (as determined by
the height of the things displayed in the widget); if the geometry
manager can satisfy this request, the widget will end up with extra
internal space above and/or below what it displays inside.
Most widgets only use this option for padding text: if they are
displaying a bitmap or image, then they usually ignore padding
options.

Specifies the 3-D effect desired for the widget. Acceptable
values are raised, sunken, flat, ridge,
solid, and groove.
The value
indicates how the interior of the widget should appear relative
to its exterior; for example, raised means the interior of
the widget should appear to protrude from the screen, relative to
the exterior of the widget.

Specifies a boolean value that determines whether this widget controls the
resizing grid for its top-level window.
This option is typically used in text widgets, where the information
in the widget has a natural size (the size of a character) and it makes
sense for the window's dimensions to be integral numbers of these units.
These natural window sizes form a grid.
If the setGrid option is set to true then the widget will
communicate with the window manager so that when the user interactively
resizes the top-level window that contains the widget, the dimensions of
the window will be displayed to the user in grid units and the window
size will be constrained to integral numbers of grid units.
See the section GRIDDED GEOMETRY MANAGEMENT in the wm manual
entry for more details.

Determines whether the window accepts the focus during keyboard
traversal (e.g., Tab and Shift-Tab).
Before setting the focus to a window, the traversal scripts
consult the value of the takeFocus option.
A value of 0 means that the window should be skipped entirely
during keyboard traversal.
1 means that the window should receive the input
focus as long as it is viewable (it and all of its ancestors are mapped).
An empty value for the option means that the traversal scripts make
the decision about whether or not to focus on the window: the current
algorithm is to skip the window if it is
disabled, if it has no key bindings, or if it is not viewable.
If the value has any other form, then the traversal scripts take
the value, append the name of the window to it (with a separator space),
and evaluate the resulting string as a Tcl script.
The script must return 0, 1, or an empty string: a
0 or 1 value specifies whether the window will receive
the input focus, and an empty string results in the default decision
described above.
Note: this interpretation of the option is defined entirely by
the Tcl scripts that implement traversal: the widget implementations
ignore the option entirely, so you can change its meaning if you
redefine the keyboard traversal scripts.

Specifies the name of a global variable. The value of the variable is a text
string to be displayed inside the widget; if the variable value changes
then the widget will automatically update itself to reflect the new value.
The way in which the string is displayed in the widget depends on the
particular widget and may be determined by other options, such as
anchor or justify.

Specifies the integer index of a character to underline in the widget.
This option is used by the default bindings to implement keyboard
traversal for menu buttons and menu entries.
0 corresponds to the first character of the text displayed in the
widget, 1 to the next character, and so on.

For widgets that can perform word-wrapping, this option specifies
the maximum line length.
Lines that would exceed this length are wrapped onto the next line,
so that no line is longer than the specified length.
The value may be specified in any of the standard forms for
screen distances.
If this value is less than or equal to 0 then no wrapping is done: lines
will break only at newline characters in the text.

Specifies the prefix for a command used to communicate with horizontal
scrollbars.
When the view in the widget's window changes (or
whenever anything else occurs that could change the display in a
scrollbar, such as a change in the total size of the widget's
contents), the widget will
generate a Tcl command by concatenating the scroll command and
two numbers.
Each of the numbers is a fraction between 0 and 1, which indicates
a position in the document. 0 indicates the beginning of the document,
1 indicates the end, .333 indicates a position one third the way through
the document, and so on.
The first fraction indicates the first information in the document
that is visible in the window, and the second fraction indicates
the information just after the last portion that is visible.
The command is
then passed to the Tcl interpreter for execution. Typically the
xScrollCommand option consists of the path name of a scrollbar
widget followed by
“set”,
e.g.
“.x.scrollbar set”:
this will cause
the scrollbar to be updated whenever the view in the window changes.
If this option is not specified, then no command will be executed.

Specifies the prefix for a command used to communicate with vertical
scrollbars. This option is treated in the same way as the
xScrollCommand option, except that it is used for vertical
scrollbars and is provided by widgets that support vertical scrolling.
See the description of xScrollCommand for details
on how this option is used.